Not exactly a lot to go on there! My guess would be a CCKW based on the attachments on the axle - a Chevy would have had leaf springs visible in that pic.
Also, it has a Timken split axle as fitted to half of all CCKWs, with that big flange around the diff. Chevies used an axle similar to the “corporation” axles on CCKWs where the casing was a single piece with the rear face a separate part for access to the diff gears. So it’s a CCKW in that pic…
In theory any truck could be used, but the space inside might be a bit more cramped. All of the gear is portable so the truck could just be used to move it from A to B and then it gets unloaded into a tent. The Chevy was more prevalent in the PTO, so maybe they used them there for kitchens?
It could be done, but there would be a bit less elbow room so maybe not as many cooks working inside at one time? I haven’t seen any pics of a kitchen in a Chevy, but then again I haven’t seen many WW2-era field kitchen pics at all.
To completely disprove it, a historian would have to locate a definitive military directive that explicitly stated, “Do not, under any circumstances, put a field kitchen in a Chevrolet G506/G7117.” Because a document like that probably doesn’t exist, you can’t definitively prove it never happened. In the field, As I’ve shown time and time again (when someone starts quoting the TMs and FMs) GIs routinely modified vehicles based on immediate needs.
Thats said, Tom has a point - The standard US Army field kitchen had three field ranges, immersion heaters, and water/food storage. The GMC CCKW-353 had a 9-foot long, 80-inch wide bed . The Chevrolet G7117 was a smaller 1.5-ton truck with a tighter 70-inch wide bed. .Fitting three stoves across the front or sides would leave very little room for a 2-to-3-man cooking crew to safely work without burning the crap out of themselves.
Which would explain why maybe there was such a directive after all. Not a TM per se, but a local comander’s guiidance prohibiting jackassery.
Possibly - except I thought most Studers went to Lend Lease? Those in US use as trucks (not tractors) seem to have been used on bases that had proper mess halls as far as I’ve seen.